Brown County Climate
Brown County, South Dakota
Avg Annual Temp
43.5°F
Annual Precip
22.4"
Annual Snowfall
39.7"
Extreme Heat Days
12.35
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Brown County Weather
Cold Northern Reach of the Plains
Brown County averages 43.5°F annually, placing it nearly 10 degrees below the national median of 53°F. It is a classic northern plains environment with 22.4 inches of annual precipitation.
Below the South Dakota Norm
The county stays 2.1 degrees cooler than the South Dakota average of 45.6°F. It is consistently among the coldest counties in the state, especially when Arctic air masses descend from the north.
Cold Air and Average Snowfall
Brown's 39.7 inches of annual snow is higher than Brookings County's 35.8 inches. Total precipitation is 22.4 inches, which is almost identical to the South Dakota state average.
Brutal Januarys and Mild Julys
Winter is the dominant season, with January temperatures averaging a frigid 11.9°F. Summer brings relief with a July average of 71.9°F and only 12 days exceeding 90°F.
A Focus on Winter Survival
Homeowners need top-tier insulation and reliable heating to survive the 11.9°F January average. Snow removal is a major part of life, as the county receives nearly 40 inches of snowfall annually.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.